IN16C1054
is, UART transmits Xon character to report external
device that it can receive more data.
1 : It shows that the number of data received in RX FIFO
exceeds the value of FUR and transmitting Xoff character
to report external device that it cannot receive more data.
If RX FIFO has space to store more data, new data are
stored in RX FIFO but after it gets full, they are lost.
For more details, refer to ‘6.3 Software Flow Control’.
3:2
1
FSR[3:2] Not used, always ‘00’.
FSR[1]
RX Hardware Flow Control Status.
0 : When FIFO or Auto-CTS flow control is disabled.
If FIFO and Auto-CTS flow control is enabled, ‘0’ is
inputted in CTS# pin and it means external device can
receive more data. This time data in TX FIFO are
transmitted.
1 : If FIFO and Auto-CTS flow control is enabled, ‘1’ is inputted
in CTS# pin and it means external device can not receive
more data. This time data in TX FIFO are not
transmitted.
For more details, refer to ‘6.2 Hardware Flow Control’.
0
FSR[0]
RX Software Flow Control Status.
0 : When FIFO or RX Software flow control is disabled.
If FIFO and RX Software flow control is enabled, it
means Xoff character has never arrived or Xon character
arrived after Xoff character had arrived(it means external
device can receive more data). This time data in TX FIFO
are transmitted.
1 : If FIFO and RX Software flow control is enabled, it means
Xoff character has arrived and external device can not
receive data any more. This time characters in TX FIFO are
not transmitted.
For more details, refer to ‘6.3 Software Flow Control’.
7.17 Page Select Register (PSR, Page 3)
If BFh is written in LCR, registers in Page3 and Page4 can be accessed. PSR is used to
determine which page to use. Table 19 shows PSR bit settings.
Rev. 00
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